Aircraft



FIG. 1 is a front elevation view of the aircraft;

FIG. 2 is a rear elevation view of the aircraft;

FIG. 3 is a top plan view of the aircraft;

FIG. 4 is a bottom plan view of the aircraft; and,

FIG. 5 is a right side elevation view, the left side being identical. 

The ornamental design for an aircraft, as shown. 